"To clarify the language" means to make something clearer or easier to understand by improving the wording or removing any ambiguity or confusion. Full definition
My mission is to respect the writer's innate voice and story and help bring out its essence by clarifying language and tightening structure. (hyperedits.com)
Look for entry points to make suggestions and ideas, using clarifying language to be as clear as possible. (edutopia.org)
The article has also been updated to clarify the language describing the source of the information. (fortune.com)